Patent GB-515256-A (GB)
Title: Improvements in or relating to machines for inserting fastenings as in the attachment of heels to boots or shoes
IPC: A43D79/00
Filed: 1938-05-27
Abstract: 515,256. Heel - attaching &c. machines. UNITED SHOE MACHINERY CORPORATION. May 27, 1938, No. 15830. Convention date, May 28, 1937. [Classes 17 (i) and 89 (iii)] In a machine for inserting fastenings in shoe heel portions, an invertible loader block transfers nails to inserting position; fastener delivery may be initiated manually and completed by power, or may be wholly automatic; actuating mechanism for a clutch driving fastener inserting mechanism is rendered ineffective unless the fastener delivery mechanism is in normal, inactive, condition; clamping abutments engaging the tread and rear faces of the heel move through different distances to apply greater pressure to the rear than to the tread; and an adjustable resistance to depression of the treadle governing fastener insertion ensures adequate preliminary clamping pressure on the work before the insertion of the fasteners. The base 18, Fig. 7, of the jack is formed with projections 17 which can enter openings 19 and then be slid forwardly along ways 16 until the base is held by a latch 21. The nail drivers 48, Fig. 5, are threaded into sleeves 52 oppositely threaded into a plate 50, so that they may be individually adjusted without changing the direction of the inclines at their upper ends. Slots in the plate 50 receive a head 53 furnishing an adjustment for the entire gang of drivers. The clamping means comprises a tread engaging plate 88 and a pair of padded members 104 arranged at angle to contact with the rear of the heel. These members are adjustable longitudinally of the shoe by a screw 78, and are each mounted at the lower end of a rack. The two racks are connected by a pair of gear segments secured to a shaft 112 the segment gearing with the tread clamp slide having the longer radius so that less pressure is transmitted to the tread of the heel than to its rear face. These clamps are connected by side rods and a hydraulic cylinder 144 tu mechanism of the kind described in Specification 442,517 so that the reaction produced by the nail driving is transmitted to the pressure head. A pair of nail pots 200 each have a hinged bottom 204 which can be lowered between opposite side walls 208 to empty the pot when the nails are changed. Each pot has an elevating slide 210 guided to reciprocate vertically and formed at its upper end with a series of V-shaped depressions continued by downwardly extending slots which receives the shanks of the nails. The slots are continued by raceway slots 213, Fig. 11, any of which may be blocked by positioning across them hooks pivoted between the raceways. The slides 210 are raised alternately. Nails lying across the slots are returned to the pots by clearers 247, Fig. 8, one for each slot, urged downwardly by springs 248 to a limit determined by a slot and adjustable pin 257. The clearers for each pot are carried by a bar 244, as are also fingers 250 depending into recesses between the raceways. The bars 244 are each reciprocated by a lever 256, Fig. 5, actuated by a spring plunger 260 carrying a roll. co-operating with a cam surface 266 on the slide 210 so that misplaced nails are returned to the pot when the slide is below the raceways. Between each pair of raceway slots is a recess 284, Fig. 11, in a wall 282 adjustable for size of nails. Between the wall and the ends of the raceways is a nail separating plate 287 provided with vertical slots 288 which, when nails are to be supplied, moves from registration with the raceways to registration with the recesses. The recesses deliver to flexible nail tubes 296. The plate is yieldingly reciprocated in both directions, adjustable stops determining its extremes of travel. The nail tubes 296 are received at their lower ends by passages 344, 346, 348, Fig. 12, the latter two pairs being arranged in blocks 352 flanged to move in guide ways 354. The blocks are linked to a rack 362 gearing with a segment 364, Fig. 5, moving with a segment of larger radius gearing with a rack 370 adjustable to different nailing designs by a finger piece 372. The nails are transferred to the jack by a reciprocating loader block. In a casing 340 slides a carrier having spaced side walls 380, Fig. 15, moving within channel shaped auxiliary slides 384 guided by the casing. The slides interengage by slots 385, 387 and pins 386, 388. Trunnions 390, Fig. 14, on an invertible loader block 392 engage openings in the forward ends of the walls 380, the block having nail receiving passages corresponding to those in the jack. A nail retaining shutter 398 has openings corresponding to the passages but normally held out of alignment therewith by springs 402. An adjustable stop 404 contacts with abutments in both receiving and delivering positions to open the shutter against the force of the springs. The walls 380 have depending arms 410, Fig. 18, carrying a spindle on which can turn a block 414 engaging a slot in a lever 334, a grove 333, Fig. 5, wherein forms part of the mechanism for actuating the nail separator. The trunnions 390 carry pinions meshing with teeth on bars 424, Fig. 14, formed at their rear ends with teeth gearing with segments 432 on levers actuated by a cam groove 438 at one side of the casing 340. The block is thus inverted during its travel. The block is retained in position by a yoke 448 engaging grooves in both the block and the frame. On partial withdrawal of the yoke the block is freed for exchange. The lever 334, Fig. 18, which reciprocates the loader block, travels between adjustable bumpers, and is, therefore, impositively driven, a recess in a flange 486 thereon co-operating with a roll 482 on a lever carried by an arm 470 of a primary lever 452 slotted to engage a block 456 on a crank pin on a disk fast on a shaft 460 driven when a clutch c, Fig. 18, is engaged. The roll 482 can yield against a spring plunger 480, Fig. 18. To effect nail supply to the jack, the operator may depress either of two hand levers 490 on opposite sides of the jack, these being fast on a spindle 492 carrying an arm 508 at the end of which is a roll 510. This roll co-operates with a member 518, urged clockwise by a spring, and this with a member 522 pivoted to a lever 496 pivoted at 494. The member 522 is urged clockwise by a spring and is provided with a tail 528. The lever 496 carries a roll normally in a recess 504 in a disk turning with the shaft 460. Depression of the lever 490, therefore causes the lever 452 to swing. As it approaches its starting position, the tail 528 is actuated to raise the member 522 and allow the roll to re-enter the recess 504 at the completion of one revolution. The clutch c is thus withdrawn and the nail supplying parts come to rest. An arm 552 co-operates with a recess 560 to lock the arms 490 down until the cycle is complete, when a plunger 564 releases the arm 552. A link 566 ensures the full movement of the arm 552 if the depression of the arm 490 has been sufficient to engage the clutch. Alternatively, an actuator secured to one of the rods 140 may depress a lever 490 as the rod connecting the cylinder 144 with the pressure head rises after the operator has released the treadle at the end of an operating cycle, as described in the prior Specification referred to. The work must then be removed while the work-clamps are rising, to clear the way for nail delivery to the jack. The main clutch C comprises a ring 590, Fig. 22, carried by a driving pulley and housing a roll cage 592, a wedge cage 594 keyed to the shaft, which is the driven element, and an abutment ring 596 free to move radially with three inclined surfaces 598, the parts being kept in approximately correct relation by a projection 602 from the wedge cage lying in an. opening in the abutment member. A pivot 608 on the roll cage carries a lever 610 having toothed engagement with the wedge cage, a spring 614 urging the parts to driving position. Normally, the lever 610 is held inwards by a roll 631 on a pivoted arm supported by a latch 634. When the starting treadle is depressed, a rod 646 rises, a shoulder 644 thereon actuating a lever 642 to trip the latch and allow the clutch to engage. As the lever 642 turns clockwise, a screw 650 thereon releases the shoulder 644 and allows the roll 631 to resume its starting position backed by the latch, and disengages the clutch at the completion of one revolution. The lever system may yield at the end of one revolution about a pivot 618 against a spring 626, and a brake may be provided to exert a constant retarding effect on the shaft to bring it to rest. A wedge 660 is connected to the lever 334 so that the main clutch cannot be engaged while the nail supplying elements are in operation, the bar 646 being displaced laterally so that it cannot actuate the latch 634. To ensure adequate clamping pressure being applied to the heel before the main clutch is engaged, the treadle 178, Fig. 6, is formed at its rear end with a slot 670 receiving a roll 672 at the end of an arm 674 fulcrummed at 676 on the frame. The roll is urged to the forward end of the slot by a spring. A roll 686 at the end of the treadle engages a lever 682 also pivoted at 676 and carrying stop screws engaging an extension of the arm 674. When the treadle is depressed, it first pivots about the roll 672, depressing the cylinder 144 and work clamps as described in the prior Specification. Not until a substantial pressure has been exerted does the roll 672 begin to leave the forward end of the slot, the rise of the rod 646 in consequence of a quick thrust of the treadle being, thus, rendered impossible. In operation, the appropriate jack tubes and holder block being in position, and all adjustments made the operator depresses a lever 490, causing engagement of the clutch c, when the primary lever 452 yieldingly actuates the secondary lever 334, the loader block and its contained nails advancing towards the jack. On leaving its normal position, the shutter 398 is closed, th